Stop mechanism for plungers.



No. 639,|75. Patented Dec. l2, |899. L. A. HWE.

STOP MECHANISM FDR PLUNGERS.

(Application filed May 15, 1 899.) (No Model.) 2 Sheets-Sheet I.

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Patented nec. l2, |399.

L. A. HOWE.

STOP MECHANISM FUR PLUNGEBS.

(Application led May 15, 1899,)

(No Model.)

2 Sheets-$heet 2.

17a/@75ml LEVIS A. HOIVE, OF BOSTON, MASSACHUSETTS.

STOP MECHANIS Wl FOR PLUNGERS.

SPECIFICATION forming part of Letters Patent No. 639,175, dated December 12, 1899.

Application iiled May l5, 1899.

To all whom, tm/ty concern,.-

Be it known that I, LEwIs ALVIN I-IowE, of Boston, in the county of Suffolk and State of Massachusetts, have invented a new and useful Stop Mechanism for Plungers, ofwhich the following is a specification,reference being had to the accompanying drawings, making a part hereof, in which- Figure l is a side elevation of a machine embodying my invention. Figs. 2 and 3 are front elevations of the head of the machine, showing the parts in different positions. Figs. 4 and 5 are sections on line 4 4 of Fig. 2, showing the parts in different position. Fig. 6 is a detail described below.

A variety of machines have long been known which when started stop automatically after one operation, and my invention relates to machines of this class in which a plunger or other reciprocating member is required to stop automatically after doing its work and in position for repeating its operation.

In the drawings I have shown my invention embodied in a stamping-machine in which awork-support A sustains the article to be stamped under the pressure of a die B', which is carried by plunger B, so that when the plunger B is forced toward work-support A the article-as, for example, a shoe-solewwill be pressed between the die B and the support- A at each downward stroke of plunger B, the die B' leaving its impression on the shoe-sole.

My new mechanism for reciprocating plunger B consists of a reciprocating member D, preferably in the form of a lever, and a connector F, which is moved to bring it into operative position through an arm F,which arm is automatically moved by the operating stroke of the plunger to release connector F and allow a spring f or equivalent device to carry a connector F out of operative position-that is, the motion of lever D about its fulcrum CZ has no effect upon plunger B until plunger B and lever D are connected by con nector F, and when so connected the motion imparted to plunger B by D automatically releases connector F from control of arm F and allows connector F to move out of engagement with lever D as lever D makes its return stroke. The return stroke of plunger B is caused by spring o or some equivalent device. This mechanism, which is my inven- Serial No. 716,856. (No model.)

tion, is far simpler and more compact and certain in operation than any other for any similar purpose known to me.

Lever D or its equivalent is actuated by pitman d, eccentric d', and shaft d2, as will be plain from the drawings, and while the power may be applied directly to shaft d2 it is in most cases desirable to gear shaft d2 to a rapid-running countenshaft cl3, especially in machines in which power is transmitted through lever D. The counter-shaft cl3 is hollow or in the form of a sleeve on a stud d4, which stud projects from abracket d5, secured to the frame of the machine, and this counter-shaft is driven by fast and loose pulleys or a friction-clutch in the usual way. Y

The operation is as follows: The operator, having placed the work on the work-support A, depresses treadle o, and thereby, through treadlerod a', bell-crank lever a2,and slide f', forces arm F againsta pin f2, fast to connector F, thereby moving connector F into its operative position between lever D and plunger B, (see Fig.4 5,) so that as lever D makes its operating-stroke it carries connector F and plunger B with it, forcing die B' against the work on support A but as connector F is thus moved its pin f2 engages cam-surface f3 on arm F and swings arm F to one side, (see Fig. 3,) and spring fmoves connector F to its inoperative position (see Fig. 4) as soon as lever D begins its return stroke and ceases to press connector F against plunger B, and lever D oscillates without affecting plunger B until treadle 0L is released, which allows slide f to return to the position shown in Fig. 4, whereupon arm F' swings over pin f2 in position to again act on connector F through pin f2, when the treadle is again depressed What I claim as my invention isl. In combination a reciprocating body, a plunger, a connector which in one position connects the reciprocating body and the plunger together; a swinging arm to move the connector positively into operative position against the force of a spring; that spring; a cam on the swinging arm 5 and a projection on the connector adapted to engage the cam and move the arm while the reciprocating body and the plunger are making their operating stroke to thereby automatically release IGO from control of arm F', as connector F and plunger B move together; all substantially ro as and for the purpose speeied.

LE WIS A. HOVE.

Vitnesses:

J. E. MAYNADIER, C. I-I. MORSE. 

